Propelling pencil



Jan. 8, 1935o A. DILLIER ET AI.- 1,987,393

\ l v PHOPELLING PENCIL Filed Dec. 9, 1952 Patented Jan. 8, 1935 i UNITED STATES PATENT OFFICE PROPELLING PENCIL n Alfred Dillier, Aesch/Basel, and joseph Gabler,

Basel, Switerland Applicationvneeeiber 9, y1932, 'serial No. 646,526

In Germany December 14,1931

3 Claims. (Cl. 120%18) The present invention relates to a mechanical a guide piece 8a which operates in the tube '7. pencil with a lead holding sleeve `containing the The key 8 is arranged to bear on the upper end lead and surroundedby a threaded sleeve and of the lead holding tube '7. In the lead holding an adjusting pin sliding in the lead holding sleeve `tube '7 is placed above the lead M thepushing with a toothed cheek engaging in the thread of pin 9. On the upper end of pin 9 is fixed the 5 the threaded sleeve through a guide slot of the toothed cheek 10, the teeth of which project lead holding sleeve, and by means of which on through a longitudinal slot '7a of the lead holding the use of longer leads a separate holding of the tube', and into the thread of the threaded sleeve lead and more simple feed thereof is attained 11 also provided with `a longitudinal slotlla, by

10 than with known mechanical pencils. which thethreads of tube 11 are interrupted. 10

This is attained with the pencil, according Thelead holding tube '7 is provided opposite the to the invention, by the lower end of the lead slot '7a with a second short slot 7b through which holding sleeve being slotted and carrying on its the key 8 also extends, as shown. The threaded circumference conical pressing segments on to sleeve 11 surrounds by its lower end part of the 15 which is pressed the threaded sleeve by thev acbottom end of the tube '7 constructed as a triple -15 tion of a pressure spring supported in the pencil slotted pincer, and lwhich by means of conical sleeve so that the lead is clamped at this point pressing segments 12 with which it is provided and on the displacement of the threaded sleeve is pressed inward-1y radially on to the lead and against this spring by pressure on the head of holds this fast. In the centre of the case 1 is the pencil, is released. y fixed a bush 13 and between this and a ring 14 20 Several embodiments of the invention are fixed on the threaded sleeve 11 is a pressure spring shown in the drawing, in which 15 which forces the threaded sleeve 11 upwardly Fig. l is a longitudinal section of the pencil, and thus effects the holding of the lead in the Fig. 2 is a partial longitudinal section on a lead containing sleeve '7 and prevents the interlarger scale, mediate tube 11 from turning. 25

Fig. 3 is a cross-section on the line III-III When, by pressing down the head 5, the pincers of Fig. 1, 12 of the lead holding sleeve '7 pressed round the Figs. 4 and 5 show a cross-section on the line lead are released and the head 5 is then manu- V--V of Fig. l in different positions, ally rotated until the toothed cheeklO comes Fig. 6 shows a further cross-section on the line into the slot 11a of the threaded sleeve 11, the 30 VI--VI of Fig. 1, loosened lead M can be moved by hand as de- Fig. '7 is a partial longitudinal section o'f a sired. second form of construction. To adjust the lead from time to time as re- Fig. 8 is a further partial longitudinal section quired, when writing, the head 5 is depressed 011 a plane dSplaCed by 90 t0 that aCCOdi'g t0 and turned manually, so that the adjusting pin 6 35 Fig. '7. by means of the key 8 which it carries pushes Fig. 9 ShOWS l2i CI'OSS-SSC'GOD 0f this 011' the the intermediate tube 11 downwardly, to release line IX-IX 0f Fig- 7, and the lead, and also causes the lead receiving tube Fig. 10 is a crossse`ction on the line X-X. '7 to be turned, and therefore the toothed cheek 40 In Fis. l, 1 is the pencil Case, which has at 1o of the pushing pin 9 by its engagement with 4o the front end a conical tip 2 provided with three the internal thread of the non-rotating interlongitudinal slits 2a, and which is screwed into mediate tube 11 causes said pushing pin to move the DSDC CaSe l by means 0f a threadd PIO- longitudinally, and to correspondingly move the jeotion. The tip 2 guides the lead M at the front lead M, as will be understood.v

end. At the rear end of the case 1 is inserted When a lead is used up, it is necessary with 45 a plus 3 on which is screwed a cap 4. On the existing systems to screw back the whole guide cap 4 is placed a top 5 movable longitudinally mechanism in order to insert afresh lead, which and @ISO TeVOlubly and in which is xed an adis made unnecessary by the present construction. justine* pin 6 The slot 11a in the threaded tube 11 permits the The adjusting pin 6 passes through the plug 3 immediate sliding back of the fresh long lead into 50 and projects into the lead holding tube '7 the the writing position. upper end of which is swivelly mounted in said The lead cannot slide back, contrary to the plug. At the lower inward V-shaped end, the case with known pencil case constructions. adjusting pin 6 has a transverse slot in which ts The example according to Figs. '7-10 has for a key 8, on the lower edge of which is fitted its object a simplification of the adjustment of 55 the lead by hand. The pencil in itself is made the same as for the rst example. There is, furthermore, fixed at the upper end of the threaded sleeve 11 a steeply bevelled bush 17 and a roller 18 projecting laterally on the key 8, which roller lies exactly above the upper edge of the bush 17. At the lowest point of the top edge of the bush 17, there is a lateral projection 19 which carries a cam 20 with two inclined sides. The highest point of the top edge of the bush 17 coincides exactly with the longitudinal slot 11a ci the threaded sleeve 11. If now the head of the pencil is pressed down, the roller 18, having been by very slightly turning the head removed from dead center position, presses down on the inclined camming upper .edge of the bush 17 which, consequently, rotates together with the threaded sleeve 11 until the roller 18 has reached the lowest point of the bush 17; in this position, the toothed cheek projects into the slot 11a of the threaded sleeve and the lead can be moved as desired. On releasingthe head 5, the roller 18 strikes on the tip of the cam 2O and runs down on one of the faces, so that the bush 17 together with the threaded sleeve l1 is rotated by an angle suiiicient to again bring the toothed cheek 10 out of the range of the slot 11a.

To insert a fresh lead, it is sufficient with this form oi construction to screw off the head and take out the adjusting pin 9, without taking the pencil apart and then having to screw it all together again.

Our improved mechanical pencil has the following advantages:

It permits the use of longer leads which is of advantage particularly in drawing. In addition, the lead can be instantaneously held fast by spring pressure so that in writing and drawing no pressing back on the lead takes place. No breakage of lead can take place by this lead being too rmly gripped. As no two-part guide cone is used as with previous constructions, no lateral displacement of the lead can take place in drawing in consequence of want of accuracy of the cone. The jaws which hold the lead fast have movement only in a lateral direction, and they are entirely invisible to the eye.

What we wish to secure by U. S. Letters Patent ist-- 1. A mechanical pencil comprising a casing tube l having a conical tip 2a at one end, a head 5 slidably and revolubly mounted on the other end of the casing tube, an adjusting pin 6 secured to and movable with said head and having a radially projecting key 8 at its inner end; a lead-receiving tube 7 fixed against longitudinal movement and revoluble in the casing tube and in the inner end of which said adjusting pin is movable, said lead-receiving tube having radially movable lead gripping members at its outer end provided on their outer sides with cams 12, an intermediate tube 11 through which the leadreceiving tube extends and which intermediate tube is revoluble and is longitudinally movable on said lead receiving tube, said intermediate tube having means at its outer end to coact with said cams to release said members of the leadreceiving tube from the lead when said intermediate tube is moved outwardly by said key, a spring to resist outward movement of the intermediate tube; said intermediate tube having internal screw threads and being provided on one side with a longitudinal slot interrupting its screw threads, and said lead-receiving tube having a longitudinal slot in one side through which said key extends, and a pushing pin slidable in the inner portion of the lead-receiving tube and provided at its inner end With a toothed cheek l0 projecting radially therefrom and through said slot of said lead-receiving tube, said toothed cheek permitting longitudinal movement o said pushing pin by said adjusting pin when said cheek is in registry with said slot of said intermediate tube, and the teeth of said cheek being engagable and coactive with the internal threads of said intermediate tube to cause lead adjusting longitudinal movement of said pushing pin when the toothed cheek of the latter is engaged with the thread of the intermediate tube, and said adjusting pin and hence also said lead receiving tube is turned by means of said head.

2. A mechanical pencil comprising a casing tube, a lead-receiving tube xed against longitudinal movement and revoluble therein, a longitudinally movable, non-revoluble internally screw threaded intermediate tube through which said lead-receiving tube extends, a spring to resist movement of the intermediate tube in one direction, said lead-receiving tube and said intermediate tube having means to cause the former to grip the lead while the intermediatetube is in normal position and to release the lead when the intermediate tube is moved against the resistance of the spring, a pushing pin in the lead-receiving tube having means to engage the screw thread of the intermediate tube and thereby cause said pin to move axially when the lead receiving tube is revolved and means to operate the intermediate tube and the pushing pin.

3. A pencil as claimed in claim 2, including means to at will axially move the pushing pin or to engage the same with the thread of the intermediate tube and thereby revolve the lead receiving tube.

ALFRED DILLIER. JOSEPH GABLER. 

